A256021 Number of (n+2)X(n+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 or 1 and no antidiagonal sum 0 or 1 and no row sum 1 and no column sum 1

33, 164, 1689, 23134, 494704, 17064206, 904174706, 74064844601, 9413114643755, 1840791210516272, 554265737552127281, 257592212385874955248, 184567323274511744214582, 203714031594496792956553885

Offset

1,1

Comments

Diagonal of A256029

Links

Table of n, a(n) for n=1..14.

Example

Some solutions for n=4
..0..1..1..1..0..1....0..1..1..1..0..1....1..0..1..1..1..0....1..1..1..1..0..1
..1..1..0..1..1..1....1..1..0..1..1..1....1..1..1..0..1..1....1..1..1..1..1..0
..1..1..1..1..1..1....1..1..1..1..1..1....1..1..1..1..1..1....1..1..1..1..1..1
..1..1..1..1..1..0....1..1..1..1..1..1....0..1..1..1..1..1....0..1..1..1..0..1
..1..1..1..1..1..1....0..1..1..0..1..1....1..1..1..1..1..0....1..1..1..1..1..1
..1..1..1..1..1..1....1..1..1..1..1..0....1..1..1..1..1..1....1..0..1..1..1..1

Crossrefs

Cf. A256029

Sequence in context: A086504 A233064 A183776 * A172077 A180943 A113752

Adjacent sequences: A256018 A256019 A256020 * A256022 A256023 A256024

Keyword

nonn

Author

R. H. Hardin, Mar 13 2015

Status

approved